Photovoltaic system



FIG. 1 is a partial perspective view of a photovoltaic system, showing my new design;

FIG. 2 is a side view thereof; and,

FIG. 3 is a front elevation view thereof.

No claim is made to the unornamented bottom of the photovoltaic system.

The broken lines which define the bounds of the claimed design form no part thereof. 

CLAIM The ornamental design for a photovoltaic system, as shown and described. 